Centrifugal pump for heating fluid by eddy current, and subsea tool for heating fluid by eddy current

Abstract

The present invention provides a centrifugal pump for heating fluid by eddy current comprising a volute and a cover, in which internally regarding the volute there are provided: an impeller positioned between two supporting annular disks of magnets each comprising a plurality of permanent magnets; and two armatures positioned at the ends of the internal assembly. In addition, the invention also provides a subsea tool for fluid heating by eddy current comprising: a centrifugal pump driven by a hydraulic motor by means of a shaft; a fluid storage tank hydraulically connected to the centrifugal pump; at least one piloted on-off valve; piloted directional valves; and a filter hydraulically connected to the centrifugal pump.

1 - 6 . (canceled) 
     
     
         7 . A subsea tool for fluid heating by eddy current, comprising: a centrifugal pump driven by a hydraulic motor by means of a shaft; a fluid storage tank hydraulically connected to the centrifugal pump; at least one piloted on-off valve; piloted directional valves; and a filter hydraulically connected to the centrifugal pump, wherein the centrifugal pump is as defined by a volute and a cover; an impeller positioned between two supporting annular disks of magnets each comprising a plurality of permanent magnets; and two armatures positioned at ends of an interior of the volute. 
     
     
         8 . The subsea tool according to  claim 7 , further comprising: temperature sensors adapted to measure the temperature of an inlet fluid and an outlet fluid of the centrifugal pump; and a rotation sensor adapted to measure the rotation of the shaft of the hydraulic motor, wherein the data generated by the sensors are sent to an electronic bottle, wherein the electronic bottle comprises a hermetic vessel, with elastomeric seals, resistant to a collapse pressure, wherein inside there are contained electronic pieces of equipment responsible for interpreting the signals from sensors, encoding and sending the same to an ROV. 
     
     
         9 . The subsea tool according to  claim 7 , wherein the piloted on-off valve is of the two-way, two-position type, normally closed with spring return, and is hydraulically piloted by a pressure line. 
     
     
         10 . The subsea tool according to  claim 7 , wherein the hydraulic motor comprises a feed line connected to a control valve and a feed line connected to a return line for the ROV tank. 
     
     
         11 . The subsea tool according to  claim 7 , further comprising a directional valve installed upstream of the pump, wherein the directional valve is adapted to select a source of the fluid inserted into the pump through a fluid inlet opening, wherein the fluid can be drawn from the fluid storage tank or from the filter, and wherein the directional valve comprises hydraulic piloting in both directions, wherein the piloting of the directional valve is done by an ROV. 
     
     
         12 . The subsea tool according to  claim 7 , further comprising a directional valve installed downstream of the pump, at a heated fluid outlet, adapted to direct the heated fluid outlet to the tank or to an external piece of equipment, wherein the valve is hydraulically piloted in both directions. 
     
     
         13 . The subsea tool according to  claim 7 , wherein a fluid accumulation tank is of the compensated type, with variable internal volume, with coatings of materials that provide thermal insulation, and comprising thrust compensators. 
     
     
         14 . The subsea tool according to  claim 7 , wherein the tool is installed on a structure attached to an ROV, wherein the structure is located at a bottom or at a rear of the ROV.